Income Taxes (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Taxes [Abstract]
Income Tax Expense (Benefit)		$ 902	$ (71)	$ 1,777	$ 170
Income (loss) from continuing operations before income taxes		$ (4,107)	125	(7,398)	(753)
Effective Income Tax Rate Reconciliation, Percent		22.00%
Deferred Other Tax Expense (Benefit)		$ 390		390
Undistributed Earnings of Foreign Subsidiaries		3,300		3,300
Tax Adjustments, Settlements, and Unusual Provisions		96
Impairments and other charges	[1]	$ 423	$ 306	$ 3,189	$ 1,514

[1] Impairments and other charges are as follows:-For the three months ended June 30, 2016, includes $290 million attributable to Completion and Production, $129 million attributable to Drilling and Evaluation, and $4 million attributable to Corporate and other. -For the six months ended June 30, 2016, includes $2.0 billion attributable to Completion and Production, $1.1 billion attributable to Drilling and Evaluation, and $8 million attributable to Corporate and other. -For the three months ended June 30, 2015, includes $211 million attributable to Completion and Production, $89 million attributable to Drilling and Evaluation, and $6 million attributable to Corporate and other. -For the six months ended June 30, 2015, includes $720 million attributable to Completion and Production, $727 million attributable to Drilling and Evaluation, and $67 million attributable to Corporate and other.